Militants Claim Photos Show Mass Execution in Iraq

Twitter Account Associated With ISIS Appears to Dozens of Captured Men in Civilian Clothes

By

Ali A. Nabhan

Updated June 15, 2014 7:43 p.m. ET

Baghdad—Photos were posted on a Twitter account claiming to show Sunni militants carrying out a mass execution of captured Iraqi Shiite soldiers, raising the prospect of a broader sectarian war in Iraq.

The photographs, accompanied by captions boasting that up to 1,700 soldiers had been executed, underscored the mounting sectarian animosity fueling the fighting between Sunni extremists and the Shiite-dominated government of Prime...